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Gr 3.708 is exhaust system attaching hardware, but 1368195 does not appear in my 12-83 1953 to 1982 Corvette parts book.
Gr 3.602, 475342 is a 80-81 Exhaust Pipe Heat Shield.
According to my Jan. 1, 1991 Chevrolet Dealer Parts and Accessories Price Schedule, which has part numbers in numerical order and gives the Group that the part can be found in, 14087645 can be found in Gr 7.240. Gr 7.240 covers Stabilizer "Bolt-Link-Spacer" parts. 14087645 is not in the Dec. 83 parts book, though.
Radios and speakers can be found in Gr 9.650. None of the numbers you posted appear in my 12-83 parts book.
I have earlier and later books at my shop. If no one can identify these for you before tomorrow, I'll check my other books in the morning. It's also possible that these numbers have been superseded or supersed old numbers.
I don't have any radio info here newer than 1975 but in 1968 GM standardized the radio code to help id them. For instance the Service Model Number is: 01VFM1. The 0 would mean the year, 1 would be Chevrolet, the V would be Corvette and the FM is well AM/FM. The number 1 or 2 at the end implies a running change made.
If the radio's you have listed are newer than 1975 I'll have to dig up some books and see if I can ID the numbers but I think they should have a service code number on them even if they are newer.
I'll see if I can figure out the other part numbers for you later this weekend.
1368195 is a clamp that holds the heat shield on the front Y pipe. The rear of the shield was held in place with the rear mounting bracket and a U bolt. The front was held in place with 1368195. 1980-1981.
I didn't get to the shop today, my daughter came home from college for Easter and my wife had some plans for me today! I can tell you that 78 only offered an 8-track, where as 79 could be had with either a cassette or 8-track.
All 77-80 stereo tape radios had a traditional dial. 81 8-tracks (the last year 8-tracks were available) and 81-82 cassette radios all had digital faces. Only the base AM/FM had a dial face in 81-82.